a = [1, 3, 4, 5, 2, 7, 9]
print('a:')
sorted_id = sorted(range(len(a)), key=lambda k: a[k], reverse=True)
print(f'元素索引序列：{sorted_id}')


c = 'hello 小慧'
d = c.encode('utf-8')
print(d.decode('utf-8'))

